Fill valve



FIG. 1 is a top, front, and left side perspective view of a fill valveshowing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a rear left side elevational view thereof.

The ornamental design for a fill valve, as shown and described.